Brain
Nestled in the light of the moon in the grass is a treasure chest that you can see with your brain. You close your eyes, and you can see the spot, but it's kept deep in your brain, and you have to use its power to find it.
のう
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If you can unlock the secrets of your brain you'll have powers like Nostradamus (のう). Nostradamus was able to look inward at his own hidden brain treasure chest and see the future, so maybe you can be like him too.